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Nucleic Acids Research, 1978, Vol. 5, No. 5 1639-1653
© 1978

Articles

Theoretical calculations of base-base interactions in nucleic acids: I Stacking interactions in free bases

Goutam Gupta and V. Sasisekharen

Molecular Biophysics Unit, Indian Institute of Science Bangalore-560 012, India

Received March 1, 1978. Stacking interactions in free bases were computed on the basis of molecular association. The results of the calculations were compared with the stacking patterns observed in a few single crystals of nucleic acid components as examples. The following are the conclusions: (i) there can be two types of stacking pattern classified as normal and inverted types for any two interacting bases and both can be energetically favourable (ii) in both the types the stacking interaction is a combined effect of the overlap of the interacting bases and relative positions and orientations of the atomic centres of the two bases (iii) crystal symmetry and H-bonding interaction may influence stacking patterns.


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